Is USPS shipping based on weight or size?

USPS Shipping: Weight and Size Considerations

The United States Postal Service (USPS) offers various shipping options, and the cost of these services is determined by multiple factors, including weight and size.

First-Class Mail

First-Class Mail pricing is based on both weight and dimensions. The weight limit for First-Class Mail is 3.5 ounces (99 grams). Items that exceed this weight are charged an additional fee.

The dimensional weight of a package is calculated based on its length, width, and height. If the dimensional weight of a package exceeds its actual weight, the package will be charged based on its dimensional weight.

Priority Mail

Priority Mail pricing is a more complex calculation that factors in weight, size, and distance.

• Weight: The weight of a Priority Mail package is charged in increments of one pound (approximately 0.45 kilograms).
• Size: The size of a Priority Mail package is also taken into account. Packages that exceed certain dimensions may incur additional fees.
• Distance: Priority Mail pricing varies depending on the distance between the sender and the recipient’s location.

Dimensional Weight for Large Priority Mail Packages

For large Priority Mail packages, dimensional weight pricing may apply. Dimensional weight is calculated by multiplying the package’s length by width by height and dividing by 166 (for domestic shipments) or 194 (for international shipments). If the dimensional weight of the package exceeds its actual weight, the package will be charged based on its dimensional weight.

Understanding USPS Shipping Costs

To accurately determine the cost of shipping a package through USPS, it is important to consider both the weight and dimensions of the package. When shipping large or bulky items, dimensional weight may become a factor. By understanding these factors, you can ensure that you are choosing the most cost-effective shipping option for your needs.